Extracts/examples from my .vimrc to make settings conditionally based on OS and network

ip-specific-extract.vim

"IP Address specific
"-------------------
"(i.e. Home or Work)
if ip == -1
	"Set proxies, Python urllib2 (TwitVim, Simplenote.vim) will automatically pick
"these up	
	let $http_proxy = 'http://<username>:<password>@<proxy-url>:<proxy-port>'
	let $https_proxy = 'http://<username>:<password>@<proxy-url>:<proxy-port>'
endif

os-specific-extract.vim

"OS Specific
"-----------
let os = substitute(system('uname'), "\n", "" ,"") "thanks to http://objectmix.com/editors/149466-operating-system-checking-vimrc-files.html#post517594
if os == "Linux"
	...
	let ip = match(system('ip addr show'), "10.0.1")
elseif os == "Darwin"
	...
	let ip = match(system('ipconfig getifaddr en1'), "10.0.1") "Or whichever enX interface you need
else "Assume windows as uname doesn't work on Windows	
	...
	let ip = match(system('ipconfig'), "10.0.1")
endif